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A snapshot of the Flex Builder 3 console

Figure 2 shows a snapshot of the console window in the Flex Builder 3 IDE when the above procedure was executed in debug mode.

The three lines of text beginning with the word Activated were produced when the Flash Player gained operating system focus. The three lines oftext beginning with the word Deactivated were produced when the Flash Player lost operating system focus.

The currentTarget and target properties of the Event object

For an explanation of the currentTarget and the target properties shown in Figure 2, see the excellent article titled Understanding the AS3 Event Flow by Jody Hall. As you will see in the next sample program, this information can be used to identify the component thatdispatched the event.

Will discuss in fragments

I will explain the code for ActivateEvent01 in fragments. A complete listing of the class file is provided in Listing 15near the end of the lesson.

Beginning of Driver class for ActivateEvent01

Listing 2 shows the beginning of the Driver class for ActivateEvent01 .

Beginning of driver class for activateevent01.

package CustomClasses{ import flash.events.Event;import mx.containers.VBox; import mx.controls.Label;public class Driver extends VBox{public function Driver(){ setStyle("borderStyle","inset");setStyle("borderColor",0xFF0000); height=100;var label:Label = new Label(); label.text = "Click browser in debug mode"label.setStyle("color",0xFFFF00); addChild(label);addEventListener(Event.ACTIVATE,activateHandler);addEventListener(Event.DEACTIVATE, deActivateHandler);}//end constructor

Extends the VBox class

The entire program is written in the Driver class and illustrates the activate and deactivate events of the EventDispatcher class.

This class extends the VBox class, so an object of this class is a VBox object.

Register event listeners

The first statement beginning with addEventListener registers an event listener on the VBox object causing it to execute the method named activateHandler when the Flash Player gains operating system focus and becomes the activeprogram.

The second statement beginning with addEventListener registers an event listener on the VBox causing it to execute the deActivateHandler method when the Flash Player loses operating system focus and is no longer the active program.

The event handler methods

The two event handler methods are shown in Listing 3.

The event handler methods.

private function activateHandler(event:Event):void{ trace("\nActivated\ncurrentTarget = "+ event.currentTarget + "\ntarget = "+ event.target); }//end activateHandler//-----------------------------=-------------------//private function deActivateHandler(event:Event):void{ trace("\nDeactivated\ncurrentTarget = "+ event.currentTarget + "\ntarget = "+ event.target); }//end deActivateHandler}//end class }//end package

Output produced by the trace function

When the methods are executed in debug mode, the call to the trace function extracts and displays property values from the incoming Event object.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Object-oriented programming (oop) with actionscript. OpenStax CNX. Jun 04, 2010 Download for free at http://cnx.org/content/col11202/1.19
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